so you have a modem/router/wifi device all in one , the only thing you need is a network switch and some network cable
I would go for this one instead of what you linked in your post :

TP-Link TL-SG105 5-port Metal Gigabit Switch(10/100/1000M RJ45 ports, lüfterloses Passivkühlkonzept)

I hope you know , all asic miners are crazy loud  , and generating  a lot of heat ...